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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98269df2405ed9bdde55030b7a038c61a1ceae9458b73c42c847154f57162b1e' 
  AND token = 'ko/n8HC5c3xcIiERpugFD08zuSytRgqtQD+Ypo9yi8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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