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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a15f7a56bf2400a4f1b87288e913bc65baa535aa58f109736e586d90cd102cf7' 
  AND token = 'VxtdAeMCDdiWnBZEbAm9LH01R9eCW3jmJ2dW59KqXgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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