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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b6ea98ea6fdef24ffc37941e8f5ee303bfb5c48c21177fd6912d179f1d7a924' 
  AND token = 'A1fciWvTAjh+14LGpjNw00EbP7fbJ58PWm+YjTnA7fU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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