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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '830f7cf30bd1af11e99012785f0cdbef1ff323e58c54f36844bcc6e1db3fc4ec' 
  AND token = '2PqcuRiytRoJ6+rW6XkXSSsMIoLrCXOUE/K8DX46SC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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