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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ade0fc591860af5eb4c0f5f5f6778000e9c56d36ec67a71eba6bfae22e7df3bc' 
  AND token = 'rHdMQCPnh9Pv4h16Yasb0Tp8uYDpbI9c4zqiJ3UpvO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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