SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d39e54d7d3a24d0b12c7daf1855ecf4a2663fb1e7e92c3d036c365b48ca905a' 
  AND token = 'UYJZFfWO0wDqY19i7LzOglBabX286vueW2+fD0HDSPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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