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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c89d0dc0b20da6ef5879a56219f82c893acd318b1733f994b76eb5233a18921' 
  AND token = '1NhFdCtq9AUAzkkG3QRawE4I7/7h9X4xTbPNQTaNEIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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