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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bf375eb00f80cab50ffac66f41742a4ec41a18f3d3e959526aa7da81b2df49c' 
  AND token = '7TSv3AEQ3m778chvTgFhmkEdqRb057ZmnQkylxRzw9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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