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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '265b66348d33b660a3d278c991f4a3b31dd2fdaaad29acaf308626a81f9c08ee' 
  AND token = '1mtNEs5q9JALIc4923Da0mP7LWQ/ctJYvFIj2ByQXBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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