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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad2bd91c5fce6f94e4bdcf23218e9cbb0f4937cc2ab1e373fd90494820ada296' 
  AND token = 'jd+SZ2p5p0RzjRp5tsHhqFKb9TZKBF3jfJlnyfDgJXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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