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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd04773b0c82b9535ad343f3e86e5ae9682eccd781ac5f858ee93558f7afffdb3' 
  AND token = 'CT0StDj3oRnJiNU9vYxGX6tbT4Vw08CYsCGh4CTEgAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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