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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8581d696d32a6242e98deb3716711f55c7def240fdad5653c1c86c6307047b7a' 
  AND token = 'Yk84aFLQWIXQV6IaOB0ZbqomdHyci6tfozkkFwKCIb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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