SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0048fd8ceb8d18a63d5c3de87951c1bbc1daafa6365741b27cee4effe968f33f' 
  AND token = 'wUGjlSGqv5TBjTi4D4sf7JX5n/exLP9pp0hE8BPDgr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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