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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d984e85b639c13ead7bc1e1dc23dc44e91632fc4129b8f9dea17477aa6ede7d' 
  AND token = 'PWE+znUNdfI3UQYkf5ZJfPP8Awm9P3XqQNwA1Kelzqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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