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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3afc4a4d53dfa0e8517c90ad343cedcdd1408c45ea7a63b83d5ac71d0df1da5' 
  AND token = '1rEhtOEKHy1Y/O3J+JvZrVNQBlhy3/pWXckV6SddpBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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