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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7688b7d98f2f58a89209a111768e2cdeaa32f0f67ace275a7e2ef2ad212ce19d' 
  AND token = 'h9LkPAMJaZhee/qHUxMdfzO+OQJEniiCP8VARCr308c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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