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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71708939923d6476bee0db3f395e85a143782ea2b9085d358cfe344dacc1f1fe' 
  AND token = 'ADUv6HSAFE7IIJXGX8gu7rUIs3XVpZB1nuRC0nhs7do=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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