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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20b488e098140858a9fcc4ab02dd2c534773bd55f3ffe989c12d440d35594e21' 
  AND token = 'rO3ATZIjA1FKT/gr+7peZ19JzrPYcmzNd9H6fKS6g+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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