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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f921f51f5654cf184afff4ca3925d74437d857e77c4a0acaccde5f7653e0f031' 
  AND token = 'hL3xlkVNf4M9QJOA8SGk/t76oxUQNNNuHB/91L5pezA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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