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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c563f7a6e2f52d17a3f037bc69a4089824dd4f9bd9ed1c6dfd10cb628085dae5' 
  AND token = '3GEvLL6+xkJ48WsU+SuOY0H84NUtkHtlWsproZF7H6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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