SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '954e0078f5e88aec1b909c35d9f6687aa2122c7c479ab266dc4f95b54dc9b2fc' 
  AND token = 'D2vR1F8VjXB+pHRVCYse6GF5gE+5qnUUhhcaFlE1fBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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