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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ee39757d9cbf4f5c67e91e5d55709f6b7ac2c32e34846eac184810f99406382' 
  AND token = 'Cunx/qLNQJnpP6pLIWirtoXMdMjQ4LeIQrouBXx6aRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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