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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '182144bc28d3d1cc7555c8f8ea7d6af4db31894b8459054d0df5a35e7b93864c' 
  AND token = '9szu/rWzK3fbZOU2qHrKS4oym4cH87z+a847xYpnf+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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