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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc7fde26c907757cac8476c60e1bae46b71c5a0e3d0a72d24c789a9c8bdbb9a7' 
  AND token = 'tLYQQHeTOVxiaE/lSwygKho+KBPx3uQtEwXOn53ZIhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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