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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed6696c35f21e79b52f6d74200a0303c8be95772a1315e4ae6231193143928b7' 
  AND token = 'NO4ThEDy9C/Mqd9wO/VMk3rUhh8yyQII6II2EFH2NTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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