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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '011cc1f9ba8208e8ca607fc4b9a7e382b1f47ef29472dc418acffc3362ae320d' 
  AND token = '5c4krqTsTylviUXLBQrIFOcrZ/+zfNqLQzo1vXVe+HA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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