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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65b2921696fd55d973a8407aa985dfcbbd295c4c0f8113271d9a52332691086d' 
  AND token = 'Mf0mTw6KWjvBvgYgr4gNg3N7PnYgkzpbELr+2a44vTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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