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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ced775133cbf5f37123f3123527c6f0d503f870cf5a1e5c5ed41f95edbd9f53f' 
  AND token = 'm4fUGMfnDW+DZXqwUtqvMOzRXhqD6jOG8CVaYeCuYXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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