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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff76aaafc10994f5244b5eb6544a9f1eec2509ac79e76b6dd5149c08c1ea3e08' 
  AND token = 'h1JqrMIkp/S4bOgsQO+0ESkkGNbgDOzv72AfG8Mba4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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