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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ca684556e267ed43da20b26ae3bca8ea52eda5f8a658a734abdf45e24f7704b' 
  AND token = '5WffO+t3c9tXwM2ZUgWNmwvtUh/Pm+u/zCp4/AWLYcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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