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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c64a30034f3cf469b189b07288c8a826d6603c003fbd1b686e79fd07f6ec4df' 
  AND token = 'NXSEXCK8Y207OZbVjFwBOK6iYFgSVqmYiYoB4DQFob4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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