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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc831b6e83003a54b6cb2bcd27aaa8001eb9d93413b0d328b1b9fbb66bc3a75f' 
  AND token = 'rVkeKLH6C35p5ZYcUir/+yBr8CJ4FrKcNWEZKy5fXAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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