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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ea62724ed5e34890ee9a74003226f7aa44800dc49d3c58be7e56ef4581c390f' 
  AND token = 'kxwDoPOmPsvjE5hW78Hn/dKVwG1PCUmtfsDW7/dFxqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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