SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6011da32d7afa0568363f432608bb1c49c2b662911a6c2c6ef28829eec346db9' 
  AND token = 'YuVnjZwxkZZ4kUhXlFepjVPU+HdYw/3VDRCNOL52qvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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