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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '936308d8d60a0ae624bce40980e94260c3dedea89305eb211454ba5d319b96f3' 
  AND token = 'NPdnLIKe8W30d416avV4qy417r5lveLR4X8Ue98FtbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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