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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbf2123cdceb9bfbcd6d67bc18371b05f0953abbdbe4e9a7f6f98baa81e08a85' 
  AND token = 'zs2Bc7PZWE72gT21dskn4E8k1S6b2kfWbZ8N56NFDMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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