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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5eef2aaeb720b5d44f9c15074f18eca1b457629daf083b1216f486b3ce50b29' 
  AND token = '9I1yCtMNLsZuWG2e4T8z8b7kWwHzyWqpC/NNNOS/TV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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