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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4c8a9a11cc1a2dc80bc2ed55e4c82fda5c7a48d1ca7ae631c02d088acf29f19' 
  AND token = 'Kds32TvYlEh2xxthh6ErvpN/4UPE6GemfVovA7nGf2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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