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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f34f2bab65e9aa219fb0bd11a90e4a279fd85b4b2e5daf2085b941d35a81e17f' 
  AND token = '6uWb9Ff2l6igBmIlv9bZJ6VOrJxBTNmA5rBtWlpKNCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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