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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06efab08152bf99c23ee1dc8704d470808ad69177db4d55e3b1a2ecf0702c328' 
  AND token = '8/TVf1+XUC8Gfap0a043lFS6lViLAP8saqIS6A+CYn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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