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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '030eda8937aa9990bdf9de6d1b38383a76518f779dbed9947e35425d1d82221b' 
  AND token = 'Fz+DylUenVwcf6aLL3/On95BQzUCy5RYSeHovIUIyvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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