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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ac144550d928996c85b530d9a79c5f30408e21ca5eb760b212a9a73416a0ea7' 
  AND token = 'uuvTdnJ85+6hUE+U59hKvBxgo1aIHAXxinWW3nqyIMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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