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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24eaccb7941e208ca0452d9c701cdb62422642ba80b5546326efc5554d23b20a' 
  AND token = 'gRZg7/xJQ005QVgS9VUAL8T49GSWI4WbFn0KPbs/TB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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