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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b48dbc2f09aea631fa8e8db60d50eaa2698ff43f6e1ef017fbd3ab6bdfa79362' 
  AND token = 'a17vzZoKgMe2n6lSiCLhjZlbdcbXHTwZurMU8zLi1Vk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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