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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e13dd3709dc1b26421c45aa22a5ba9fd8f163fa2f49e58636715917daacc65a4' 
  AND token = 'owaG3cV7DvmRNfNq/iV1jcC7ETlt0vO5w5nxee2cnP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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