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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dbc685cccb570be2293733881e97cb55ec837a5ea503f59ba44b8ef9d1ac16b' 
  AND token = 'UwoTxjKEEk1pWpRvM6YXV+iSDpsBjQQPTp3QeZm/m0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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