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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28dd2db909d2de30908ddcf7d91537c14ca4c9ba51218a384c3ff8f83f78ff84' 
  AND token = 'ik1eBYLp787Ydy6HGA+ZIZnIicMh8JV6vaVrIKY79/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00091

JSON explain

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