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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39c6da0169891acc7fab250dbef8a7b21a6468fe5fa6c11b5dda9e3394d428b2' 
  AND token = 'KEsK7ntxsq3bvav8QSakbdjQqF192/P2PzxU/HM/DUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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