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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c3df1fae9e6d27f3f0e2fe4ec1808569dd39378667a06efea5179fc058024d9' 
  AND token = 'YkLmJ1bVn9nyGo9rQ6T6805dMb5V7hBVvfgJOYdEkMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}