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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b9da847e0cf67c0cc28e15270d70e7c41bcbfbfce6ec5568017de3612308782' 
  AND token = 'utDk8PA1qjMQ5sk4noWbwxc+XIq/CPZL0UZj1GWN8A4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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