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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d55acabe03d3fde7d7e067af8b29ae2805ae00bc29e97774689bee36d0ef548' 
  AND token = 'jDMsZTOgNJ99lfQTDVDnWGerdPD9oL04tMjcOiisVFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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