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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfd03dc4282395b45e09cac723129072a9ac67656215dd190732507d7b6093c9' 
  AND token = 'pVLTyWYX399LPYcc3WxCVhIJuiqqjKYO4/CGOSfcqpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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