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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52138fd0dc76717664830b1205e58ad6aa620901ea80a5d48f40f691547f6fc7' 
  AND token = '92itS4qAWUpF41m9OKx9M1kMIBhgtNniuEsPSDxA8wc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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