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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f49b710fa7238155cd1e99026212cda8b40f5f52099af32feaafa56667b4cdf' 
  AND token = 'hvdf2KfBPCXWu+toWEMkJLATfy55CdB3LfBTVl6tWvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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