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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8633960d4f57c80e4fb95020443cc8a6ef79fee6fdc36ace2797c8a1ba844924' 
  AND token = 's282C8pgkhxP3fs4lM1AMeRGJinlmKcgNIlmiCuRErg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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