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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '677576f61197c9ce79f7f79ae8ac92b0d2af48244b0ea016e688006208239e5f' 
  AND token = 'CmPK1le3dQeTKRy461CLfkC+AM+mymp7Fb4GuDZmnjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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