SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d9f90795d9fb09d3e7dc819aa841324b9b38bfd93bafb4cb49be669e56d1116' 
  AND token = 'PQCRJQw5oHU9jRBKJGcEuuHGFMFuh0l79zgPFrN5NsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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