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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95930fa41933a6adcf9d181b6d08a361f04f97fb42595673ec319b027c187d89' 
  AND token = '7fzZIcb2Y26oVSJ+fxNF0FxftOvYUe7eABYC4Yo8leY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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