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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8b83180aa382a2bd47dedafa5b4b03044c80824e4a7f7b2b533caafd4fa058f' 
  AND token = '/DLiyVwrylbw3T+9nzR9LPljchQAmrhIQ1BGQ2Tljfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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