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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99337d39e625b74f407bd5e9a937add26233a85ed05b1e869265b7b9cd03a5d7' 
  AND token = 'lRezroh82BLPQ9VQi/3FTzs3ErFj4oGmadzbivqHoVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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