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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88bc238d044a120b73f0f7889d74efb4056f9acf50f9513d8466e188e07bd40b' 
  AND token = '4JtqspkkjEtv9jjC9ztdW2PL0iFf78bA0oz2RS0Hrfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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