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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '205a84cbac70a681a613be338aca8fa276460866a11cb57ae6212d2dfbe51b19' 
  AND token = '11DFbLFVsZhSmTks3q0YNL29cesFZ47T1CqftkCLLcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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