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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dc3c2f4feb9c72b76c635d37fa4f3cebe26a85b46dd4ea2f1212f068b89a74c' 
  AND token = 'k8ATeNArC9umlklRr7JTn840OtvVglWLP/Y7psDOsqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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