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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8fdedd21609a5d2934f2b3e214a9c9efecd4e348b036b3b44a62f6281f2760b' 
  AND token = '/brGTSuW/TspgMMFgAKVBcvZ71S8pSqee3qT+VU4OsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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