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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '630559c1d53629d423daa87c8e9b0b06966ee57691c9fc0dbada2e5ccbfa7196' 
  AND token = '754lBgJyfC/+UdgYY9r/cSu3dm7ffRS6UZy9Zu0jcN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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