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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4128f47b794c635d7dc4052375cb316bad85267d19a54e6d030a4d2895cab8c8' 
  AND token = 't8WlfbKJOQcgWAKRUF78tVa3m+sESpPnjnI0wmKecbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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